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88 lines
1.9 KiB
88 lines
1.9 KiB
#include "clapack.h" |
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doublereal sasum_(integer *n, real *sx, integer *incx) |
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{ |
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/* System generated locals */ |
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integer i__1, i__2; |
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real ret_val, r__1, r__2, r__3, r__4, r__5, r__6; |
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/* Local variables */ |
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integer i__, m, mp1, nincx; |
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real stemp; |
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/* .. Scalar Arguments .. */ |
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/* .. */ |
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/* .. Array Arguments .. */ |
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/* .. */ |
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/* Purpose */ |
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/* ======= */ |
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/* takes the sum of the absolute values. */ |
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/* uses unrolled loops for increment equal to one. */ |
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/* jack dongarra, linpack, 3/11/78. */ |
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/* modified 3/93 to return if incx .le. 0. */ |
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/* modified 12/3/93, array(1) declarations changed to array(*) */ |
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/* .. Local Scalars .. */ |
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/* .. */ |
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/* .. Intrinsic Functions .. */ |
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/* .. */ |
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/* Parameter adjustments */ |
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--sx; |
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/* Function Body */ |
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ret_val = 0.f; |
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stemp = 0.f; |
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if (*n <= 0 || *incx <= 0) { |
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return ret_val; |
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} |
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if (*incx == 1) { |
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goto L20; |
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} |
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/* code for increment not equal to 1 */ |
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nincx = *n * *incx; |
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i__1 = nincx; |
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i__2 = *incx; |
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for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) { |
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stemp += (r__1 = sx[i__], dabs(r__1)); |
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/* L10: */ |
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} |
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ret_val = stemp; |
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return ret_val; |
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/* code for increment equal to 1 */ |
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/* clean-up loop */ |
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L20: |
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m = *n % 6; |
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if (m == 0) { |
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goto L40; |
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} |
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i__2 = m; |
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for (i__ = 1; i__ <= i__2; ++i__) { |
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stemp += (r__1 = sx[i__], dabs(r__1)); |
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/* L30: */ |
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} |
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if (*n < 6) { |
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goto L60; |
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} |
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L40: |
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mp1 = m + 1; |
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i__2 = *n; |
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for (i__ = mp1; i__ <= i__2; i__ += 6) { |
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stemp = stemp + (r__1 = sx[i__], dabs(r__1)) + (r__2 = sx[i__ + 1], |
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dabs(r__2)) + (r__3 = sx[i__ + 2], dabs(r__3)) + (r__4 = sx[ |
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i__ + 3], dabs(r__4)) + (r__5 = sx[i__ + 4], dabs(r__5)) + ( |
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r__6 = sx[i__ + 5], dabs(r__6)); |
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/* L50: */ |
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} |
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L60: |
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ret_val = stemp; |
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return ret_val; |
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} /* sasum_ */
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